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Financial instruments and risk management (Tables)
12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Schedule of financial instruments with carrying amounts that differ from fair values
Financial instruments with carrying amounts that differ from their fair values are as follows:
 
 
 
 
December 31, 2016
 
 
December 31, 2015
 
  
 
Fair Value Hierarchy Level
 
Carrying
Amount

 
Fair
Value

 
Carrying
Amount

 
Fair
Value

Capital lease obligations (i)
 
Level 2
 
$
61,400

 
$
57,741

 
$
62,443

 
$
57,976

Series 1 Debentures (ii)
 
Level 1
 

 

 
19,927

 
19,927

(i)
The fair values of amounts due under capital leases are based on management estimates which are determined by discounting cash flows required under the instruments at the interest rates currently estimated to be available for instruments with similar terms.
(ii)
The fair value of the Series 1 Debentures is based upon the period end market price.
Schedule of non-financial assets measured at fair value on a non-recurring basis
Non-financial assets measured at fair value on a non-recurring basis as at December 31, 2016 and 2015 in the financial statements are summarized below:
  
 
December 31, 2016
 
 
December 31, 2015
 
  
 
Carrying Amount

 
Change in Fair Value

 
Carrying Amount

 
Change in Fair Value

Assets held for sale
 
$
247

 
$
(1,556
)
 
$
180

 
$
(1,384
)
Concentration Risk [Line Items]  
Schedule of maximum exposure to credit risk for accounts receivable and unbilled revenue
The Company’s maximum exposure to credit risk for accounts receivable and unbilled revenue is as follows:
 
 
December 31, 2016

 
December 31, 2015

Trade accounts receivables
 
$
39,274

 
$
24,028

Other receivables
 
806

 
708

Total accounts receivable
 
$
40,080

 
$
24,736

Unbilled revenue
 
$
15,965

 
$
17,565

Schedule of trade receivables aging
As at December 31, 2016 and December 31, 2015, trade receivables are aged as follows:
 
 
December 31, 2016

 
December 31, 2015

Not past due
 
$
34,263

 
$
23,946

Past due 1-30 days
 
2,956

 

Past due 31-60 days
 
2,000

 

More than 61 days
 
55

 
82

Total
 
$
39,274

 
$
24,028

Total revenues  
Concentration Risk [Line Items]  
Schedule of major customers
The following customers accounted for 10% or more of total revenues:
Year ended December 31,
 
2016

 
2015

Customer A
 
47
%
 
34
%
Customer B
 
25
%
 
10
%
Customer C
 
21
%
 
41
%
Accounts receivable and unbilled revenue  
Concentration Risk [Line Items]  
Schedule of major customers
At December 31, 2016 and December 31, 2015, the following customers represented 10% or more of accounts receivable and unbilled revenue:
 
 
December 31, 2016

 
December 31, 2015

Customer 1
 
42
%
 
42
%
Customer 2
 
22
%
 
5
%
Customer 3
 
13
%
 
%
Customer 4
 
13
%
 
21
%
Customer 5
 
7
%
 
20
%
Customer 6
 
3
%
 
11
%